Archaic poetry in a classical time

In Qumran, the Yahad deemed Habakkuk 1-2 only as worthy of tafsirpesher, famously; despite that all traditions, including the Greek, relate three chapters. In 2021, one Joshua Bryan Henson submitted a PhD thesis on all three chapters. He concluded that the same author composed all of it. Excepting the poems in Habakkuk 3 which are ... older, not younger. So those are cited by the author, which is how they survive.

The language of Habbakuk is, overall, classical "CBH": think, the prosaic frame of MT Deuteronomy and Judges-through-Reigns - once corrected. Theodore Hiebert argued Habakkuk's poetic inclusiones are by contrast archaic "ABH". Henson agrees, on assumption for ABH of this corpus: Gen 49, Exod 15:1–18, Num 23:7–10, 23:18–24, 24:3–9, 24:16–19, Deut 32:1–43 and 33:1–29, Judg 5:1–30, 1 Sam 2:1–10, 2 Sam 22:2–51=Ps 18 and Ps 68. Not any of the Prophets, even Amos or Hosea.

...and not Ps[alm] 78. For Henson, this is a CBH composition affecting ABH style. One imagines such might hold of certain other preëxilic Psalms beside 18 and 68. This blog has endorsed Esther as a late production aping CBH; Henson rolls this into "LBH". So as you see Henson does not distinguish between the Temple cant of core "LBH" from other stuff which just happens to fall at the same time. Since Henson nails Habakkuk as CBH, I assume he takes its "Babylon" as Babylon.

By the way this shows that Psalm 78's composer in the CBH era, presumably ~700 BC, owned a library of ABH work. That library, says Henson, would have included the two poems now in Habbakuk 3. Habbakuk himself of course would have done his work after all that, the Hebrew scriptoria now being under Babylonian control.